RockNES 5.00 beta 12 released

New version of the NES emulator for PC.

Changelog:

- Small changes on rom loading & fix.
- CHR RAM is initialized with 00h instead of FFh to avoid glitches on startup.
- Added a ROM fix for the bad dump of Wrestlemania Challenge (CRC 3C9FE649).
- Changed the CHR RAM dump filename extension from .bin to .chr to avoid an overwrite with the PRG ROM dump filename.
- Removed all unmasked CHR bankswitching.
- Minor changes in the mapper names and in the GUI.
- Fixed mappers 44, 90, 234, 255.
- Fixed joypad #2, oops!
- Fixed a bug in the joypad register.
- Documentation updated.